earthquakes

/Tag: earthquakes
21 09, 2017

What is plate tectonics? Earthquakes and volcanoes

By |2019-08-16T08:59:53-07:00September 21st, 2017|Geology|0 Comments

Plate tectonics: The world as seen from space (flattened out) The continents move around When you look at a map of the world, it seems as though it was always like that - North America on top of South America, Europe north of Africa, Australia off at the bottom right. But really all of the dry land on Earth moves [...]

29 07, 2017

What are logarithms? Numbers and math

By |2017-07-29T16:38:58-07:00July 29th, 2017|Math|0 Comments

Earthquake in Peru Logarithms are a way of writing numbers using exponents. "Log 100" means the exponent you'd need to use to get 100 starting from 10. That would be 2, because 102 = 100. So Log 100 = 2, and Log 1000 = 3. Logarithms are useful for thinking about big numbers in general terms, when [...]

27 07, 2017

Ibn Sina – Islamic medicine

By |2019-09-16T20:24:05-07:00July 27th, 2017|Islam|4 Comments

Where ibn Sina came from: Uzbekistan Ibn Sina and the Samanids in Uzbekistan Ibn Sina (known to Europeans as Avicenna) was a scientist. He was born about 980 AD in the north-eastern part of the Abbasid Empire. That was in the kingdom of the Samanids. (It's modern Uzbekistan.) Who were the Samanids? Medieval Islamic science All our medieval Islam [...]

16 07, 2017

Who is Poseidon? Greek gods

By |2018-09-17T09:02:48-07:00July 16th, 2017|Greeks, Religion|1 Comment

The god Poseidon rules the ocean Ocean god Poseidon The Greeks thought of the god Poseidon as a god of violent, unpredictable movement. He is most often the god of the ocean, which is of course the biggest, most unpredictable, and most dangerous thing around. Many Greeks spent a lot of time sailing on the ocean, and they paid [...]

6 07, 2017

Ancient Greek climate, plants, and animals

By |2019-09-05T06:43:36-07:00July 6th, 2017|Greeks|39 Comments

Ancient Greek climate: The island of Rhodes Good fishing Fishing was very important to early Stone Age people, and fishing is probably what brought the first people to Greece. No part of Greece is more than about forty miles from the sea: a couple of days walking. So Greece was a great place [...]

25 06, 2017

Where are the Alps? Mountains in Europe

By |2019-01-23T09:52:38-07:00June 25th, 2017|Geology, Northern Europe|0 Comments

The Alps Where are the Alps? The Alps are a long row of mountains dividing southern Europe from northern Europe.  France and Germany are on one side of the Alps, and Italy is on the other side. More about Northern Europe Which mountains are the highest? When did the Alps form? The Alps [...]

23 06, 2017

Earthquakes, tsunamis, and the Richter scale

By |2019-02-05T06:11:50-07:00June 23rd, 2017|Geology|31 Comments

Earthquake in Peru - Earthquakes can split the ground open! What causes earthquakes? What causes earthquakes? Earthquakes happen when the moving tectonic plates that make up the surface of the Earth move apart or bump into each other, or slide under each other. This movement tears apart the surface of the Earth, or crunches [...]

7 06, 2017

Predicting earthquakes in ancient China

By |2018-04-18T18:18:12-07:00June 7th, 2017|China, Science|0 Comments

Chinese seismograph (132 AD)(thanks to National Geographic) Earthquakes are a big problem in China, where there are many earthquakes, and often strong ones. Under the Han Dynasty, a man called Zhang Heng invented the first seismograph in the world - the first way to record an earthquake. Zhang Heng's seismograph was a bronze [...]